Abstract
The X-ray and Mossbauer studies of the Brownmillerite phase have been carried out in the given work and the well-known literature data on the single phase compounds with a perovskite structure in ferrite strontium SrFeO3-δ have been analyzed. It has been found out that all Fe valence states for any phase composition of ferrite strontium are determined by its local oxygen environment. It allows us to understand the behavior of Fe transition from one valence state to another when adding oxygen vacancies and to explain the Fe structural states in the SrFeO3-δ oxide including single and two-phase compositions. This approach is a more general case for description of the all known compounds and synthesized phase combinations in SrFeO3-δ and the formula considered in literature for the single-phase structures well agrees with it.
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